package com.lin.servlet;

import java.io.IOException;
import java.io.PrintWriter;
import java.util.Enumeration;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class TestHttp extends HttpServlet {

	/**
	 * Constructor of the object.
	 */
	public TestHttp() {
		super();
	}

	/**
	 * Destruction of the servlet. <br>
	 */
	public void destroy() {
		super.destroy(); // Just puts "destroy" string in log
		// Put your code here
	}

	/**
	 * The doGet method of the servlet. <br>
	 *
	 * This method is called when a form has its tag value method equals to get.
	 * 
	 * @param request the request send by the client to the server
	 * @param response the response send by the server to the client
	 * @throws ServletException if an error occurred
	 * @throws IOException if an error occurred
	 */
	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

		response.setContentType("text/html");
		response.setCharacterEncoding("UTF-8");
		PrintWriter out = response.getWriter();
		out.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">");
		out.println("<HTML>");
		out.println("  <HEAD><TITLE>A Servlet</TITLE></HEAD>");
		out.println("  <BODY>");
		out.println("  <center>");
		out.println("  <h2>请求头信息列表<h2>");
		out.println("  <table border=1>");
		out.println("  <tr><th>名字</th><th>值</th></tr>");
		//返回请求头信息名字集合
		Enumeration enums=request.getHeaderNames();
		while(enums.hasMoreElements()){
			String headName=(String) enums.nextElement();
			out.println("  <tr>");
			out.println("  <td>"+headName+"</td>");
			out.println("  <td>"+request.getHeader(headName)+"</td>");
			out.println("  </tr>");
		}
		out.println("  </table>");
		out.println("  <hr>");
		out.println("Method: "+request.getMethod()+"<br>");
		out.println("Request URL: "+request.getRequestURI()+"<br>");
		out.println("Protocool: "+request.getProtocol()+"<br>");
		out.println("PathInfo: "+request.getPathInfo()+"<br>");
		out.println("Remote Address: "+request.getRemoteAddr()+"<br>");
		String path=request.getContextPath();
		String basePath=request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+request.getRequestURI();
		out.println("path: "+path+"<br>");
		out.println("basePath: "+basePath+"<br>");
		out.println("  </center>");
		out.println("  </BODY>");
		out.println("</HTML>");
		out.flush();
		out.close();
	}

	/**
	 * The doPost method of the servlet. <br>
	 *
	 * This method is called when a form has its tag value method equals to post.
	 * 
	 * @param request the request send by the client to the server
	 * @param response the response send by the server to the client
	 * @throws ServletException if an error occurred
	 * @throws IOException if an error occurred
	 */
	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

		this.doGet(request, response);
	}

	/**
	 * Initialization of the servlet. <br>
	 *
	 * @throws ServletException if an error occurs
	 */
	public void init() throws ServletException {
		// Put your code here
	}

}
